Pulsator for milking-machines.



R. WAHNOCK.

PULSATOR run MILKiNG MACHINES.

1,270,473. APPLICATION FLLED AUGQT. 1915- Patented June 2 SHEETS-SHEET2.

III I IIIIIII IIIIIIII IVEN TOR.

W ATTORNEY UNITED STATES PATENT OFFICE.

ROBERT WARNOCK, F BLOOMFIELD. NEW JERSEY, ASSIGNOR TO EMPIRE CREAMSEPARATOR COMPANY, OF BLOOMFIELD. NEW JERSEY, A CORPORATION OF NEWJERSEY.

PULSATOR FOR MILKING'MACHINES.

Specification of Letters Patent.

Patented June 25, 1918.

F0 all whom it may concern:

Be it known that I, Ronna'r WARNOCK, a

itizen of the United States, residing at Bloomfield. county of Essex,and State of \ew Jersey, have invented certain new and usefulImprovements in Pulsators for Milking-Machines. of which the followingis a pecification.

This invention relates to milking machines and particularly to pulsatormechanism for machines of the type in which vacuum or pressure isapplied intermittently to the teat cups of the apparatus by automaticmechaaism operated by the pressure or suction.

It has long been recognized in vacuum operated milking apparatus thatcontinuous suction on the cows teats was very injurious. and variousmeans have therefore been provided for producing intermittent orpulsating action on the teats so as to relieve the same or restore themto their normal .condilion. For this purpose apparatus has heretoforebeen devised for automatically cutting otf the vacuum at intervals. orfor cutting oti' thevacuum and applying intermittent pressure to theteat. and my present invention relates to improved mechanism foreffecting this result.

The present invention relates particularly to the t vpe of pulsatormechanism disclosed in the application of A. C. Macartney. for pulsatorsfor milking machines, filed February 27. 1915). Serial No. 10.90l. andembodies certain improvements ap )licable to the mechanism therein setforth.

Certain novel features embodied in the structure disclosed in thisapplication are accordingly not claimed herein, as they form the subjectmatter of said application Serial No. 1090i. Certain other novelstructural features illustratedin this case relating particularly to theconstruction and arrangement of the pulsator housing and milk cocks arenot claimed herein because these. features are included in the subjectmatter of an application of A. C. Macartney. filed August 23. 1913.Serial No. 786287. a

In the accompanying drawings; which form a part of this saecification,and in which I have illustratec one preferred embodiment of myinvention, Fi ure 1 is a side elevation of pulsator mec anism embodying111v improvements. Fig. 2 is a view artl-y in side elevation and partlyin section lboking at the pulsator mechanism from a position at rightangles to that shown in Fig. 1. Fig. 3 is a vertical section of theapparatus looking at the apparatus from the same point of view as Fig.1, the pulsator valve being in its upper position. Fig. I is a viewsimilar to Fig. 3, with the pulsator valve shown in its lower position.F ig. 5 is a horizontal section on line V\" of Fig. 3. Fig. 6 is adetailed perspective view of the reversing valve and its carrier. Fig. 7is a view of the opposite side of the reversing valve carrier. the valveseat ports being indicated to show the action of the valve. Fig. 8 is asideview and Fig. 9 a cross-section of a modified form of reversingvalve. Fig. 10 is' a vertical section of the pipe for exhausting the airfrom the milk pail illustrating a modified form of strainer or trap. Fi11 is a transverse section through the va ve carrier and disk taken online XI-XI of Fig. 6.

Referring to the drawings in detail. the numeral 1 designates a milkreceiving pail which is provided with a removable cover 2. upon whichthe pulsator mechanism is preferably mounted. The milk pail cover may beof any suitable form, but I have shown an improved construction which issatisfactory in use and economical from a manufacturing point of view.As shown. the cover is made in two parts, 3 and 4. each of which may bepressed from sheet metal. the upper part 3 being of slightly largerdiameter than the lower part 4. and being bent down around its eripheryto form an outer flange The ower part 4 is also bent down to provide aninner flange (5.. The upper part )referablv has an offset 7 formedtherein. with a diameter corresponding to that of the lower part 4.

-and into which such lower part fits. thereby facilitating theassembling of the parts and insuring proper centering. The flanges 5 and6 form a groove between them which The enreceives the rim of the milkpail. gagement of this groove with the rim of the milk pail preventslateral displacement of the cover on the pail. the cover being normallyretained upon the pail during the use of the apparatus by atmosphericpressure as a vacuum is constantly maintained within the pail by theconnection of the suction apparatus therewith. The .upper member 3 ofthe cover preferably has its central portion raised as indicated at 8.forming a seat for the cylinder 9 of the pulsator motor. the middle ofthe upper member being thickened or filling-r ngs 10 inserted in orderto provide the necessary stock to hold the screws 11. which are utilizedto secure the cylinder to the cover. The parts of the cover may besecured together in any suitable manner, as. for instance. byspot-welding.

Mounted on or formed integral with the cylinder 9 of the pulsator. isthe pulsator valve casing 12. Formed in this casing are an outlet port13 and a pair of inlet ports 14 and 15 connecting with a chamber 16. Theport 13 is connected to a source of vacuum by means of a pipe 17 whichin the preferred construction shown opens into a casing 18. which has aremovable cover 19, the latter being preferably provided with a nipplefor connection with the usual flexible pipe (not shown) leading from thevacuum main which extends through the stable. The casing is alsoconnected'by means of a pipe '20 with the interior of the milk pail. Avacuum is thus maintained atthe port 13 of the pulsator valve casing andwithin the milk pail. In the casing 18 is mounted an outwardly openingcheck valve 21. which controls the entrance to the pipe 20, therebymaintaining a vacuum Within the milk pail when the flexible supply pipeis disconnected from the nipple. The use of this check valve preventsthe inrush of the stable air into the milk pail, and also maintains avacuum in the latter, thereby retaining the cover upon the pail. Bymounting the casing 18 in the position shown. and providing it with aremovable cover, it is possible to get at the check valve for cleanmg orregrinding by simply removing the cover and without interfering with theconnections to the milk pail and pulsator valve casing.

In order to prevent the milk spray from passing into the vacuum supplypipe. the pipe 20 may be filled with wire gauze 22, or other materialadapted to absorb or entrap the spray, this material being held in placeby suitable means, as by the removable bushing 23 screwing into thelower end of the pipe. By removm this bushing the auze ma be removed wenever necessary or cleamn or replacement. In the construction ilustrated in Figs. 3 and 4 the gauze is preferably arranged in the formof a coil or roll, so that the air and spray pass through it. In Fig. 10a modified construction of strainer or trap is illustrated in which thegauze 80 is arranged in the shape of a cone, it being supported in thepipe 20 b means of the removable bushin 23, and eing preferably providedwith three or more arms 81 at its upper end which hold it in verticalposition. Any other suitable are ralligement of the gauze may beemployed.

rojecting from the chamber 16 are one or more nipples 2t. to which areconnected the flexible pipes (not shown) leading to the teat cups. Wheredouble chambered teat cups are used the pipes connected to the nipples2i preferably lead to the outer chambers of the cups. while the innerchambers of the cups through which the milk is withdrawn are connectedby other flexible pipes (not shown) to nipples 25. projecting from valvecasings 26. mounted on the milk pail cover (see Figs. 1 and 2). Thisarrangement of teat cups is well understood and is illustrated anddescribed in the application of Macartney. Serial No. 10.904, abovereferred to, and such illustration and description are not. therefore.repeated herein. With this arrangement it will be understood that nomilk is drawn through the pipes connected to the nipples 21 andtherefore no milk passes through the pulsator valve casing.

The valve casing may have secured to its upper end a carrying handle 27,and hooks 28. on which to hang the teat cup claws when not in use.

Reciprocating in the casing 12 is the pulsator valve 29 which isconnected by means of the short piston rod 30 to the driving piston 31,the latter reciprocating in the cylinder 9. The valve '29 has a recess32 on one side thereof adapted to register at proper times with theoutlet port 13, while on the other side the valve has a recess 33 whichat the same time registers with the port 14.

The recesses 32 and 33 are connected by a 190 transverse passage 34.When the valve is in its upper position, as is shown in Fig. 3, thechamber 16. and consequently the nipples 24. and the associated pipesand teat cup chambers are connected with the source of vacuum throughthe lower port 14, recesses 32 and 33. passage 34 and port 13. When.however. the valve is moved to its lower position, as shown in Fig. 4.the ports 13 and 1 1 are' closed so that the vacuum 119 supply is cutfl. while the chamber 16. nipples 24 and pipes and teat cup chambers areopen to atmospheric pressure through the upper port 15. the part of thealve chamber 12 above the valve 29 being at all times open to theatmosphere through the hole 35 in the top of the chamber.

The valve 29. is caused to reciprocate by the force of atmosphericpressure acting alternately u on the to and bottom of the piston 31, t eother si e of the piston being subjected to the vacuum. In order toadmit the vacuum and atmospheric pressure in proper sequence to thecylinder 9 above and elow the piston. any suitable reversin valvemechanism maybe employed, pre erably a mechanism substantially like thatdescribed and illustrated in the application of Macartne Serial No.10.904, above referred to. uch a, mechanism is illustrated of which(shown in dotted lines, Figs. 2

and 7 is connected to the passage leading to the vacuum port 13. Theupper port 40 in the valve seat is connected by a passage 41'to thecylinder 9, above the piston 31,

while the lower port 42 is connected by a passa e 43 with the cylinderbelow the piston. he lower end of the cylinder is pref erably providedwith a counter-bore 44, into which the passage 43 opens, therebyfacilitating the boring of this passage, and

rmitting it to be made straight at its ower end and avoiding thepecesslty of providing a branch passage or hole in the side wall of thecylinder. The valve member 36, shown in Figs. 6, 7 and 11, is preferably constructed in two parts, one of which 45 may be termed the valvecarrier, while the other art 46 is the valve disk or valve proper. hevalve disk 46 has a recess or port 47 formed therein,- which is adaptedto overlie the ports 39, 40 and 42 in the valve seat 38, and to connectthe port 39 with one or the other of the orts 40 and 42, dependin uponthe position of the valve, the ot er of said ports 40 and 42 being opento the atmosphere (see Fig. 7). The valve disk 46 fits loosely ina.recess 45 in the valve carrier 45, it being held from turning thereinin any suitable manner, as by having a. notch 48 formed in one sidethereof which engages with a pin 49, fitting in a hole 50 in the valvecarrier. The valve disk is also preferably provided with a smallprojection 51 on its back which engages with a hole at the bottom of therecess in which the valve disk is carried. The presence of this smallprojection prevents the disk from being accidentally inserted in itsrecess with its wrong side adjacent the seat. The advantage of makingthe valve disk separate from the valve carrier is that a tight seatingof the valve is insured at all times, this resulting from the fact thatit is a vacuum valve and is thereby sucked toward its seat by the vacuumacting through the port As the valve is independent from the carrier.the latter need not be so accurately fitted. and any twist to which thevalve carrier is subjected by its operating mechanism cannot have anytendency to lift the valve away from its scat. This construction ofvalve which is capable of movement independently of the valve carrier Iregard as a valuable feature of my invention. In some cases it isdesirable to employ resilient means to retain the valve disk in contactwith the valve scat 0 as to prevent leakage between the disk and itsseat which might occur during the shifting of the valve and so preventthe vacuum from drawing the disk against the seat in the intendedmanner. Such resilient means may be of any suitable form. such forinstance, as the light spider spring 90, shown in Figs. 6 and 1.1.

In Figs. 8 and 9 I have illustrated a modified construction of thereversing valve in which a port 47 is preferably formed in each face ofthe valve, these ports being conveniently made by pressing roundedindentations in the valve. By making a port in each face it makes nodifference which side ofthe valve is placed adjacent to the valve seatso that the user of the machine cannot make the mistake of inserting thevalve in such a way as to prevent the apparatus from working.

Any suitable mechanism for reciprocating the reversing valve may beemployed. preferably that illustrated. which is the same as thatdescribed in the said application of Macartncy. Serial No. 10.904. abovereferred to. This mechanism consists of a lever 53 which is pivoted atone end upon the pin 37, and which is provided with a slot 54. VVorkingin this slot is a pin 55 which also projects through a slot 56 in theside of the casing 12. and is carried by the pulsator valve :29. Thelever 53 has an angular projection 57 at its outer end, which has a holeformed there-through. Projecting through this hole is a plunger 59, thehead 60 of which is pivoted to the pin 49, one end of which is mountedin the hole 50 in the valve carrier 45. as already described. while theother end of the pin bears in a hole in an arm 61. pivoted to the pin37. Mounted under compression stress between the arm 57 and the head 60.is :1 spring 62. Fig. 1 shows the pulsator valve. and consequently thepin 5.3 in upward position. hen. the pulsator valve and pin 55 move downit will be seen that the lever .33 will swing down about the pivot pin37. the arm 57 carrying down with it the outer end of the plunger 59.When the pin .35 reaches its lowermost position. the plunger .39 hasbeen moved down about the pivot 49 until it has passed the dead centerso that the spring 6:2. acting on the plunger exerts an upward PIPSHHLupon the pin 49. which will throw thc valvc carrier and valve to upperposition. as soon as the valve carrier is released by the latchmechanism to be described. This latch iucchanisni comprises a latch Ipivotcd at its lower end at the point 34. and having a curved 101therein. the walls of which engage the pin 55. The latch H3 ha a notch61; in its side. which is adapted to cooperate with one or the other ofthe lug I"? formed on the valve carrier. So long as one of these lugs isin engagenlent.v with the notch the valve carrier is maintained in oneof its terminal positions. As the pin 55 moves down in the curved slot65, however, it will cause the latch to swing about its pivot. thecurved slot being so shaped that the latch will swing for enough tocause the notch 66 to disengage the lug 67 when the pulsator valve andpin 55 reach the limit of their stroke. At this time the plunger 59 hasassed the dead center so that as soon as t e notch disengages the lug ofthe valve carrier, the latter will be forced under the influence of thespring plunger to its opposite extreme position.

.This will reverse the connection of the orts 40 and 42 with the vacuumport 39, an the atmosphere, respectively, and will accordingly cause theatmospheric pressure to act upon the opposite side of the piston 31,thereby forcing the piston and pulsator valve to the opposite limit oftheir stroke. This movement of the pulsator valve, carrying with it thepin 55, will obviously again reverse the position of the valve 46 sothat a continuous reciprocation ofthe piston and pulsator valve isproducedjwhich will continue as long as the'vacuum supply 'ismaintained. It will be understood t at any other suitable reversingvalve mechanism may be employed, the particular feature of thismechanism, which forms a part of my present invention, being theconstruction of the valve proper independent of the valve carrier, andso that it may be held in engagement with its seat by the vacuum.

The construction of the pulsator valve and its casing and thearrangement of the connected ports 14 and 15 present certain features ofadvantage in that long bearing surfaces for the valve are provided inthe casing, thereby reducing the wear and eliminating leakage. It willbe seen that the valve casing 12 has a slot 5 6 1n one s1de thereof,through which the pin 55 pro ects. Atmospheric pressure is thuspermitted to act on the side of the valve near th1s slot. If it beattempted to use an ordinary piston valve in which the connection fromone s de of the valve to the other is around the side of the valve, anunbalanced pressure would be produced which would tend to force thevalve too tightly against the side of the easing opposite from the slot,thereby wearing the casing eccentrically. I overcome this objection byusing instead of a piston valve of the usual form with an opening arounda the valve. the construction shown in which the two recesses 32 and 33are connected by an opening 34: through the interior of the valve. Inthis way the vacuum does not reach the side of the valve opposite to theslot. and therefore no unbalanced pressure is produced. The bottoms ofthe recesses 32 and are preferably curved. as shown in Fi 5. thisconstruction facilitating the menu acture.

The use of the I W connected ports It and 1-3 permits the ngggss s 32and to be formed well down below the top of the valve, thereby pei wilt[ing a long cylindrical bearing surface above the recesses. whichprevents leakage. At the same time the stroke of the valve need not beunduly lengthened. This results from the fact that when the valve is inits upper position. connection may be made through tbi esses and thepassage 3-l, between the po' 3 and the lower port 14, thereby connecungthe teat cups with the suction. while in order to connect the teat cupchambers with atmospheric pressure, it is onlv necessary for the valveto move down sufficiently far for its upper end to open the upper port15. At the same time the cylindrical upper end of the valve tightlvcloses the vacuum port 13 and prevents the leakage of air into thisport. Also by having the air admission port 15 at a different level fromthe port 14-, it is possible to place the latter at substantially thesame level as the vacuum outlet port 13, it thus being possible to makethe recesses '32 and 33 comparatively short. This again permits thecylindrical bearing surfaces of the valve to be made long.

'hile I have illustrated and described in detail one preferredembodiment of my invention, I do not wish to be understood as therebylimiting myself to such detailed construction any further than specifiedin the claims, but I realize that my invention is capable of beingembodied in various forms of apparatus, and I therefore desire to coverthe principle of thesame broadly in whatever form it may be embodied.

Having thus described my invention, I claim:

1. In pulsator mechanism for milking apparatus. the combination of apulsator. vacuum operating means for actuating the same and valvemechanism actuated by said vacuum operating means, said valve mechanismincluding a valve seat. a valve carrier and a alve carried by saidcarrier and held in sliding engagement with said seat at all times bythe action of the vacuum. I

2. In pulsator mechanism for milking apparatus. the combination of apulsator.

controlling the action of said vacuum operated mechanism. said controlvalve mechanism including a valve seat. a valve carrier movablethereover. means actuatcd bv the movements of the vacuum operatedmechanism for moving said valve carrier. and a valve member looselymounted in a recess in said valve carrier.

4. In pulsator mechanism for milking apparatus. the combination of apulsator valve. vacuum operated mechanism for actuating the same. andcontrol valve mechanism for controlling the action of said vacuumoperated mechanism. said control valve mechanism including a valve seathaving ports therein, one of said ports being in constant communicationwith a source of vacuum. a valve carrier movable over said valve seat.actuating means for said valve carrier. said valve carrier having arecess therein adjacent to said valve seat. and a valve member loosel vmounted in said recess and having a recessin its face adapted to connectsaid vacuum port in the valve seat with one of the other ports therein.said valve member being held in contact with its valve seat by theaction of the vacuum.

5. In pulsator mechanism for milking apparatus. the combination of apulsator valve, vacuum operating means for actuating the same. andcontrol valve mechanism for controlling the action of the vacuum on saidoperating means. said control valve mechanism including a valve seat. avalve carrier having a recess therein. and a valve mounted in saidrecess. said valve being so formed that it cannot be inserted in saidrecess in improper position.

6. In pulsator mechanism for milking apparatus. the combination of acasing having a cylindrical bore and ports formed in opposite sidesthereof. a pulsator valve mounted to reciprocate in said bore and having cylindrical portions at the top and bottom thereof connected by amember having cylindrical side ortions. said top and bottom portions anside portions fittings-aid bore. said valve having a transverse openingtherethrough adapted to form a connection between the port in one sideof said casing and the port in the other side thereof. and means forreciprocating said valve.

7. In pulsator mechanism for milking apparatus. the combination of acasing having ports therein and having a slot in the side thereof. apulsator valve working in said casing and having a portion at one sidethereof fitting the bore of said casing adjacent to the slot therein andhaving a second portion fitting the diametrically opposite side of thebore of said casing and having a passagewav through the body thereof.whereby a balanced valve is produced. and means for reciprocating saidval e.

8. In pulsator mechanism for milking apl parato the combination of acasin having ports in opposite side thereof ant having a slot in the -ic thereof between said ports. a pulsator valve working in said casingand having recesses in opposite sides thereof adapted to communicatewith said ports, said valve having side bearing portion engaging theside wall of said casing adjacent; to said slot and the diametricallyopposite wall of said casing respectively. and having an openingextending thercthrough connect ing the recesses in said valve, and meansfor reciprocating said valve.

9. Inpulsator mechanism for milking apparatus. the combination of acasing having a port in one side thereof. and having a pair of portsarranged at ditferent levels in the opposite side thereof, and apulsator valve working in said casing. and having upper and lowerportion fitting the same. and an intermediate portion provided with apassagewav adapted to place the port in one side or the -.casing incommunication with one of the ports in the other side of the cats ing.said valve being movable to a position to cover both of said last-namedports. and to open the second port at the other side of the casing.

10. In pulsator mechanism for milking apparatus. the combination of acasing having an outlet port in one side thereof. a chamber havingconnections for teat cups at one side of the casing. a vacuum inlet portopening from said casing into said chamber. an air inlet port openingfrom said casing into said chamber. a pulsator valve working in saidcasing. means for admitting air into said casing above said valve. saidvalve being formed to provide a passageway for placing said vacuumoutlet port in comniunicatitm in said vacuum inlet port in one positionof the valve and to simultaneously cover said air inlet and beingmovable to another position tot-over said vacuum ports and to uncoversaid air inlet port.

11. In pulsaton 1ll('(lll1ilti for milking apparatus. the com ination ofa casing having a vacuum outlet port. a connection from said port to asour e of vacuum. an atmospheri inlet opening. two connected inletport-. a common connection from both of said ports f '1' teatcup and apulsator valve working in said ca ing acting in one position to coverone of said inlet ports and place the second inlet port in communicationwith the vacuum outlet port. said valve acting in another position tocover said second inlet port and admit atmospheric pressure to saidfirst inlet port.

12. In pulsator mechanism for milking apparatu the coinl'iination ofamilk pail cover. a casing mounted thereon having a bore fora pnlsatorvalve. and a bore forming a c vlind'er. a pulsator alve working in saidfirst-named bore, a piston working in metal mem ers, the upper memberbeing of larger diameter than the lower member and having a downwardlyturned flange at its periphery, and having an annular ofl'set, the owermember fitting said annular offset and having a downwardly turned flangeat its periphery.

14. In milking apparatus, a milk pail cover comprising superimposedsheet metal members, having spaced downwardl turned peripheral flanges,the upper mem r havmg a raised central portion to form a seat for thepnlsator valve casing, and a filler between said raised portion and thelower member of the cover to provide -'st'odk' for em gagement withattaching means for the casing.

15. In milking apparatus, the combination with a milk pail cover of'apulsator valve casing mounted thereon, a check valve casing, aconnection from said check valve casing to said ulsator valve casing, aconnection from said check valve casing to the milk pail cover, a checkvalve mounted in said casing and controlling said connection to the milkpail cover, and a removable cover for said check valve casing permittingaccem to said valve.

16. In milking apparatus, the combination with a milk pail cover of apulsator valve casing mounted thereon, a check valve casing, aconnection from said check valve casing to said pulsator valve casing, aconnection from said check valve casingto the milk pail cover, a checkvalve mounted in said casin and controlling said cottnection to the milkpail cover, and a removable cover-for said check valve casing permittingaccess to said valve, said cover having a nipple for connection with avacuum pipe.

17. In milking apparatus, a milk pail, a milk pail cover, a pipeconnected to said cover, an air filter mounted in said pipe, acheck-valve casing connected to said pipe and a connection tosaid checkvalve casing through which air may be exhausted from said milk pailthrough said air filter and check valve.

18. In milkin a )paratus, a milk pail, a pipe through finch air may beexhausted from said pail and a removable, cone-shaped, gauze air filterin said pipe.

19. In milking apparatus, a milk pail cover, a pulsator valve casingmounted thereon, a check valve casing, a connection from said checkvalve casing to said pulsator valve casing, a connection from said checkvalve casing to the milk ail cover, a check valve in said casingcontroiling said last-named connection, gauze mounted in said last-namedconnection and a removable bushing for holdin said gauze. in position.

20. n pulsator mechanism for milkin apparatus, the combination of avalve seat laving ports thereimat least one of which is a. vacuum port,a valve carrier mounted to slide over said seat and having a recessformed in the portion thereof movable over said orts and a, valve memberhaving a recessed face adapted to slide in sealing contact with thevalve seat, said valve member being mounted in said recess in the valvecarrier for free movement in the direction of the valve seat and beinheld against said seat by t e action of the vacuum.

21. In pulsator mechanism for milking apparatus, the combination ofvacuum operating means, a valve carrier, a connection from said vacuumoperating-means to said carrier for actuatin the same, a valve seat, anda valve carriedliy said carrier and held in engagement with said seat atall times by the 'action of the vacuum, said valve being mountedindependently of the valve carrier supporting and actuating means so asto be incapable of displacement from sealing contact with said valveseat through the action of said actuating means.

22. In pulsator mechanism for milking apparatus, the combination of apulsator, vacuum operated mechanism for actuating the same, and controlvalve mechanism for controllin the action of the vacuum on said operatmmeans, said control valve mechanism inc uding a valve seat, a movablevalve carrier having a recess therein, a valve mounted in said recessand resilient means acting on said valve for urging it toward said seat.

23. In pulsator mechanism for milking apparatus, the combination of apulsator, vacuum operated mechanism for actuating the same and controlvalve mechanism for controlling the action of the vacuum on said operatmmeans, said control valve mechanism inc uding a valve seat, a movablevalve carrier having a recess therein, a valve freely mounted in saidrecess, and a s iderspring inserted in said recess back 0 said valve andurging said valve against said seat.

21. In pulsator mechanism for milking apparatus, the combination of avalve seat having a vacuum port therein, a valve carrier resting uponand movable over said seat and a valve carried by said carrier and heldin engagement with said seat at all times by the action of the vacuum.

adapted to be 25. In pulsator mechanism for milking apparatus, thecombination of a valve seat hav ing a plurality of ports therein. atleast one of which is a vacuum port. a valve carrier mounted on saidseat and movable over said. ports and having a recess in its faceadjacent to said seat and a valve freel mounted in said recess andadapted to slide on said seat to control said orts. said valve beingheld in engagement y said seat by the action of the vacuum.

26. In pnlsator mechanism for milking apparatus, the combination ofvacuum operatmg means, a valve carrier having a recess therein, a valveseat, a valve carried by said carrier, in said recess and adapted toslide over said seat and to be held in contact therewith by vacuum, saidvalve being capable of free movement in said recess in the direc tion ofthe valve seat, a pivoted member for actuating said carrier. :1 pivotedmember operated by said vacuum operating means and a spring fortransmitting power from the latter to the former of said pivotedmemberl's for actuating said 'alve carrier and va ve.

27. In pulsator mechanism for milking apa valve carrier pivoted at oneside of said seat and having a portion with a recess therein adapted toswing over the ports'in said seat, a valve member having a recessed faceadapted to slide in sealing contact 'with the valve seat said valvemember-being mounted in said recess in the valve carrier for freemovement in the direction of the valve seat, and means whereb the valvecarrier is caused to oscillate over said seat upon the movement of saidvacuum operating means.

28. In pulsator mechanism for milking apparatus, the combination ofvacuum operating means, a valve seat having ports therein, at least oneof which is a vacuum port, a valve carrier pivoted at one side of saidseat and having a portion with a recess therein adapted to swing overthe ports in said seat, a valve member having a recessed face ada ted toslide in sealing contact with the Va ve seat, said. valve member beingmounted in said recess in the valve carrier for free. movement in thedirection of the valve r-Pltt, but being held against any movement insaid recess in a plane parallel to the valve seat, and means whereby thevalve carrier is caused to oscillate over said seat upon the movement ofsaid vacuum operating means.

ROBERT \VARNOCK.

